129 results about "Mixed oxide" patented technology

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

The invention belongs to the technical field of environmental barrier coatings, and particularly relates to an environmental barrier coating for an outer ring block of an engine and a preparation method of the environmental barrier coating. The environmental barrier coating sequentially comprises a silicon layer, a double-ytterbium silicate layer, a single-ytterbium silicate layer, a transition layer and an abradable layer from inside to outside, and each of the transition layer and the abradable layer comprises a mixed oxide containing aluminum oxide, lanthanum oxide, magnesium oxide and neodymium oxide. The mass ratio of aluminum oxide to lanthanum oxide to magnesium oxide to neodymium oxide in the transition layer is (50-70): (15-25): (10-15): (8-10), and the mass ratio of lanthanum oxide to magnesium oxide to neodymium oxide in the abradable layer is (40-60): (20-30): (15-20): (5-8). The environmental barrier coating has significantly improved abradability, corrosion resistance, life in high temperature service environments.

The invention relates to a design method of a stainless steel-based natural seawater electrolysis high-efficiency catalyst, a catalyst and application thereof, and the design method comprises the following steps: taking a stainless steel mesh as a carrier, and placing the carrier in a high-concentration alkaline solution; the stainless steel surface is subjected to oxidation treatment by applying long-time oxidation voltage to form an amorphous nickel-iron mixed oxide layer, the stainless steel with the oxidation layer formed on the surface is further soaked in a solution containing metal M salt, and nanoclusters loaded with the M salt of the stainless steel oxidation layer are formed through pulse electrodeposition; and the loading capacity and the cluster size of the nanocluster are regulated and controlled by changing the deposition current and the pulse frequency of pulse electrodeposition. Compared with the prior art, excellent seawater electrolysis anode catalysis corrosion resistance is achieved through commercial stainless steel surface modification treatment and precious metal nanocluster loading, and the stainless steel material subjected to modification treatment achieves long-term stable operation under the real seawater electrolysis industrial current density working condition.

The invention relates to a preparation method of electrical-grade magnesium oxide for slowing down current leakage, belongs to the technical field of electrical-grade magnesium oxide, and solves the problems of poor insulativity, relatively high electrical leakage and the like in the actual use process of electrical-grade magnesium oxide. Comprising the following steps: step 1, weighing nano calcium oxide and lanthanide series metal oxide, putting the nano calcium oxide and the lanthanide series metal oxide into a quartz crucible, and uniformly mixing to obtain a primary mixed oxide auxiliary agent; 2, heating the mixed oxide auxiliary agent obtained in the step 1 in a muffle furnace, cooling to room temperature under a drying condition to obtain white powder, and grinding to obtain an oxide auxiliary agent; 3, absorbing ethyl acetate (EA), hydrogen-containing silicone oil and polycyclic aromatic hydrocarbon (D30), putting into a centrifugal tube, and uniformly mixing to obtain a liquid film coating auxiliary agent; the method has the advantages that the current leakage of the electrical-grade magnesium oxide with poor insulativity can be slowed down by adding the metal oxide aid under the condition that the original properties of the electrical-grade magnesium oxide are not changed. The method is simple, convenient and obvious in effect.

Disclosed is a zirconium- and cerium-based mixed oxide composition exhibiting high reducibility, a method for preparing the same, and uses thereof in the field of catalysis.

The invention belongs to the technical field of target materials, and discloses a multi-element doped indium germanium oxide ceramic target material and a preparation method thereof. The ceramic target material comprises indium oxide, germanium oxide and doped oxide, and the doped oxide is one or two of cerium oxide, hafnium oxide or titanium oxide; the preparation method comprises the following steps: mixing In2O3 powder, GeO2 and doped oxide powder, carrying out ball milling, drying, grinding and sieving on the mixed powder to obtain mixed oxide powder, sequentially carrying out compression molding and cold isostatic pressing on the mixed oxide powder to obtain a target material green body, putting the target material green body in an oxygen atmosphere, and carrying out sintering to obtain the target material. A multi-element doped indium germanium oxide ceramic target material is obtained by using a multi-stage sintering method; by adjusting the doping elements in the target material, the proportion of the doping elements and the staged sintering temperature and time, the density and the conductivity of the target material can be remarkably improved.

The invention relates to a paste for establishing a joint connection between parts or joining partners, comprising at least one metal component. According to the invention, metal oxide particles and / or metal mixed oxide particles and / or a mixture of metal oxide particles are used as the metal component, an inert polyether is provided as the solvent, and a reducing agent is contained which reduces the metal oxide particles and / or metal mixed oxide particles and / or the mixture of metal oxide particles during heating and at least partially escapes. The invention further relates to the use of a paste according to the invention for electrically, mechanically and / or thermally connecting at least two parts or joining partners by means of a sintering method. Finally, the concept of the invention also comprises a method containing at least the following steps: - applying the paste to at least one first part, - placing at least one further part such that the applied paste is arranged between the two parts on the surfaces thereof to be connected.

A method and cascade reactor system for producing elemental rare earth metals and rare earth-aluminum alloys via aluminothermic reduction are disclosed. The method involves combining rare earth oxides or halide salts with aluminum powder, initiating a thermite-type reaction under inert or controlled atmospheric conditions, and recovering the molten metal product. Fluxing agents may be used to enhance slag fluidity and phase separation. The cascade reactor comprises multiple thermite zones with staged ignition, thermal transfer mechanisms, and slag separation interfaces, enabling sequential reduction of mixed feedstocks. The system supports both batch and continuous formats and achieves high recovery yields, reduced aluminum contamination, and compatibility with alloying and post-purification processes. The invention is adaptable to individual rare earth species and mixed oxide concentrates, offering a scalable, energy-efficient, and environmentally favorable route to rare earth metal and alloy production.

The present invention belongs to the field of materials production, and more specifically to a method for producing precursors of mixed oxides using a synthetic route that begins with organic acid salts and other organic compounds, based on a step of mixing using a high-shear mixer and a subsequent heat treatment, to thus produce mixed oxides, which can be used, for example, as cathode material for batteries. This synthetic route is simple and fast, has low energy use, is environmentally friendly, and neither the starting materials nor the resulting by-products are harmful to health. Furthermore, at an industrial level, it is easily scalable.

An electrochemical cell has a cathode active material selected from mixed lithium transition metal oxides containing Mn and at least one second transition metal; lithium intercalating mixed oxides containing Ni, Al and at least one second transition metal; and lithium metal phosphates, wherein the outer surface of the particulate cathode active material is at least partially coated with an oxide selected from transition metal oxides, lanthanide oxides, and oxides of metals and half metals of groups 2, 13, and 14 of the periodic system; and an electrolyte composition containing at least one silyl ester phosphonate of formula (I)and at least one silyl ester phosphonate of formula (II)

Catalyst for selectively converting CO2 + H2 to CO and H2O, the catalyst comprising a porous support, the support carrying particles, wherein the porous support comprises an oxide of Ce or a mixed oxide of Ce and Zr and wherein the particles comprise at least one ferromagnetic compound, wherein said ferromagnetic compound comprises (i) at least one oxide of Fe, Co, and Ni, or (ii) at least one metal of Fe, Co, and Ni or (iii) at least one oxide of Fe, Co, and Ni and at least one metal of Fe, Co, and Ni.

The present disclosure relates generally to reverse water-gas shift processes, integrated Fischer-Tropsch processes, and supported reverse water-gas shift catalysts for conducting these processes. The catalysts described herein include a support that is a cerium oxide support, a titanium oxide support, an aluminum oxide support, a zirconium oxide support, or a mixed oxide support comprising a mixture of two or more of cerium oxide, titanium oxide, aluminum oxide, and zirconium oxide; and manganese, present in an amount in the range of 0.5 to 20 wt % of the catalyst, based on the total weight of the catalyst.

The compositions disclosed herein are compositions having a mixed oxide core consisting of alumina-free cerium oxide and zirconium oxide. The mixed oxide core contains, based on its total weight, about 15% to about 60% by weight of cerium oxide and about 40% to about 85% by weight of zirconium oxide. The mixed oxide core has a rare earth oxide coating on its surface, the rare earth oxide being selected from the group consisting of cerium, lanthanum, neodymium, praseodymium, yttrium and mixtures thereof. Furthermore, noble metals such as palladium or rhodium are dispersed on the surface of these compositions, and the dispersion of rhodium or palladium is higher compared to compositions containing a mixed oxide core without a rare earth oxide coating. Furthermore, methods for producing these compositions are also disclosed herein. These compositions can be used as part of a catalyst system.

The invention is applicable to the technical field of glass fibers, and provides a low-dielectric glass fiber, which is characterized by comprising 50.0 to 58.0 wt% of SiO2, 18.0 to 26.0 wt% of B2O3, 13.0 to 18.0 wt% of Al2O3, 0.0 to 5.0 wt% of Mg0, 2.0 to 5.0 wt% of Ca0, 0.0 to 0.5 wt% of R20, 0.0 to 1.5 wt% of TiO2 and 0.0 to 3.0 wt% of a titanium-zirconium-hafnium ternary mixed oxide. The method can effectively solve the problems that in the prior art, bubble detection lags behind, a temperature control system operates in an isolated mode, and technological parameter optimization depends on experience, instant feedback of bubble data is achieved through the real-time online bubble detection technology, and powerful support is provided for accurate adjustment of clarification technological parameters.

The present invention describes the preparation of heterogeneous catalysts of mixed oxides based upon niobium and mixed oxides of zinc, manganese, nickel, cobalt and / or aluminum, originating from hydrotalcites (HTs) as precursor phase of heterogeneous catalysts, and application thereof in the chemical recycling of poly(ethylene terephthalate) (PET) for the production of metal free bis(hydroxy)ethylene (BHET) monomers and oligomers having a processing performance similar to that of the homogeneous catalysis system.

The application is a preparation method of a chemical vapor deposition dysprosium hafnium oxide ceramic coating, which uses Dy and Hf metal particles and related process gas as raw materials, uses chemical vapor deposition technology, and controls the heating temperature of a vacuum chamber of a chemical vapor deposition device, vacuum degree, process gas type and flow, deposition time and other factors to first co-deposit and prepare Dy2O3 and HfO2 mixed oxides on the surface of a nickel-based high-temperature alloy, and then in-situ synthesize a Dy2Hf2O7 ceramic coating with a fluorite structure at high temperature. The ceramic coating has the advantages of stable high-temperature phase structure, low thermal conductivity, sintering resistance, molten salt corrosion resistance and excellent strain tolerance, is suitable for use in high-temperature flame service working conditions above 1300 DEG C, and can improve the heat insulation effect of the thermal barrier coating of the turbine blade of an aero-engine.

Disclosed is a composition comprising at least a cerium and zirconium based mixed oxide comprising zirconium, cerium, lanthanum and optionally at least one rare earth other than cerium and lanthanum; said mixed oxide exhibiting a high thermal resistance and are in particular capable of maintaining a large specific surface area even in a high temperature environment. Also disclosed is a process for the synthesis of such compositions.

Disclosed herein are compositions having a mixed oxide core comprising ceria and zirconia, which is free of alumina. The mixed oxide core contains about 15 wt% to about 60 wt% cerium oxide and about 40 wt% to about 85 wt% zirconium oxide, based on the total weight of the mixed oxide core. The mixed oxide core has a rare earth oxide coating selected from the group consisting of cerium, lanthanum, neodymium, praseodymium, yttrium, and mixtures thereof. Further, a noble metal including palladium or rhodium is dispersed on the surface of these compositions, and the composition has a higher rhodium or palladium dispersion relative to a composition comprising a mixed oxide core without the presence of a rare earth oxide coating. Methods of producing these compositions are also disclosed. The composition may be used as part of a catalyst system.

An electret (1) is formed by subjecting an inorganic dielectric body (2) to a charging process. The inorganic dielectric body (2) is composed of a metal compound containing at least either Al or Mg, and the total mole fraction of Al and Mg among all the metal elements contained in the metal compound is greater than 50%. The metal compound may contain a metal oxide or a metal salt and may be an Al-containing oxide or salt, a Mg-containing oxide or salt, or a mixed oxide containing both Al and Mg.

The invention discloses a 2.5-dimensional antimony-doped tin dioxide / polyurethane-ruthenium-titanium mixed oxide / polymer temperature response type electrocatalytic oxidation electrode and a preparation method, and belongs to the technical field of electrocatalytic oxidation electrode preparation. Amorphous antimony-doped tin dioxide is loaded on molecular sieve particles in a hydrolytic polycondensation reaction and annealing mode; coating a thermal expansion layer formed by polyurethane on the surface to obtain auxiliary electrode particles; bonding a ruthenium-titanium mixed oxide layer on the porous titanium substrate, and then spraying a polymer layer formed by an N-isopropylacrylamide-acrylic acid copolymer to obtain a main electrode; suspending the auxiliary electrode particles on the main electrode, then standing, reducing the diameter of a surface pore channel, close to the auxiliary electrode particles, of the main electrode, heating and expanding a thermal expansion layer, close to one end of the main electrode, of the auxiliary electrode particles, and finally locking the thermal expansion layer in the pore channel of the main electrode to obtain the temperature response type electrocatalytic oxidation electrode. The main electrode and the particle auxiliary electrode are fully and stably combined, the electrode composition structure is endowed with the dynamic self-adaptive adjustment capability, the traditional electrode composition / structure adjustment limitation is overcome, and the in-situ adjustable performance and the in-situ material recovery characteristic are achieved.

The present invention relates to a mixed oxide of titanium, niobium, and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08; M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs, and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2, and 0 ≤ z ≤ 0.3. Figure for abbreviation: [Fig. 8]

The application relates to the technical field of tungsten-based hard alloys, and discloses a preparation method of Nd2O3 and CeO2 co-doped WC-8Co hard alloy, which comprises the following steps: step 1, Nd2O3 / CeO2-W doped powder is prepared by using a wet chemical method, and the preparation specific process is as follows: rare earth oxide nitrate and APT weighed are respectively dissolved in deionized water, and a magnetic stirrer is continuously and violently stirred to mix, so that the rare earth elements and the APT are fully reacted and mixed; then, a vacuum air oven is used for drying to obtain a precursor powder; after the precursor powder is ground in a jade mortar, the powder is first kept at 480 DEG C to 520 DEG C in a nitrogen gas pipe furnace for 2h to 3h, and the powder is changed into a mixed oxide containing rare earth oxide Nd2O3 / CeO2 and tungsten oxide. The preparation method of the Nd2O3 and CeO2 co-doped WC-8Co hard alloy has the advantages that the prepared Nd2O3 and CeO2 co-doped WC-8Co hard alloy has high friction and wear resistance and long service life, and the method provides a new idea for the research of WC-based hard alloys co-doped with multiple additives.

A process may prepare catalysts advantageously usable in the hydrotreatment processes, for example in hydrodesulfurization, hydrodenitrogenation, hydrodearomatization processes of hydrocarbons. Such catalysts may include mixed oxides of nickel, aluminum, molybdenum, and tungsten and optionally a transition metal Me selected from Zn, Mn, Cd, and a mixture thereof, an organic component C, and possibly an inorganic binder B. The mixed oxides may include an amorphous phase and a pseudo-crystalline phase isostructural to wolframite.

The application discloses a preparation method of nano-graphene lubricating oil and relates to the technical field of lubricating oil. The modified zirconium-titanium composite particles are used as a catalyst to synthesize base oil, so that the heat resistance effect is improved; then, under the assistance of microwaves, graphene is stripped to improve the dispersibility of the graphene in the lubricating oil, and a hydrogen bond network is formed on the surface of the modified zirconium-titanium particles, so that the fatigue wear is reduced, and the service life is prolonged; on the basis, electrochemical deposition is generated between the particles and the graphene in the friction process, so that the self-repairing effect is achieved. The modified zirconium-titanium composite particles are first injected into pre-cooled liquid nitrogen copper molds by precursor sol, are rapidly frozen, are dried by vacuum sublimation to remove ice crystals, and form snowflake-like hierarchical porous structures, so that the lubricating effect is improved; then, low-temperature annealing is performed to form Zr-O-Ti mixed oxide skeletons, so that the pore collapse is effectively inhibited, and the service life is prolonged; and then, through the surface hydroxyl groups and capillary action, ionic liquids are adsorbed to form a coating layer, so that the lubricating effect is enhanced.

Disclosed herein are mixed oxide compositions containing mixed oxides of cerium, zirconium, and a mixture of iron and strontium. These compositions optionally also may contain additional rare earth dopants. These mixed oxide compositions surprisingly exhibit enhanced low temperature oxygen storage capacity (OSC), even after aging at elevated temperatures. These mixed oxide compositions importantly contain iron and strontium (as oxides) and this mixture of iron and strontium surprisingly provides the mixed oxide composition with improved OSC even after aging at elevated temperatures, in particular improved OSC at lower temperatures. The compositions may be used as catalytic carriers which may be used in gas exhaust purification catalysts.

The present disclosure relates generally to supported CO2 conversion catalyst comprising: a support that is a cerium oxide support, a titanium oxide support, an aluminum oxide support, a zirconium oxide support, a zinc oxide support, a silicon oxide support, or a mixed oxide support comprising a mixture of two or more of cerium oxide, titanium oxide, aluminum oxide, zirconium oxide, zinc oxide, and silicon oxide; at least one of copper, iron, platinum palladium, zinc, and manganese, present in an amount in the range of 0.05 to 15 wt% of the catalyst, based on the total weight of the catalyst; and at least one of tellurium, bismuth, tin, antimony, germanium, selenium, arsenic, boron, indium, and silicon present in an amount in the range of 0.05 to 15 wt% of the catalyst, based on the total weight of the catalyst.

This application relates to the field of electrochemical energy storage materials technology, and more particularly to a negative electrode material, its preparation method, and its application. The negative electrode material comprises a mixed oxide, the general chemical formula of which is shown in Formula 1, M... 2±α A 0.5n‑x M1 x Nb n‑y M2 y O 3n+1‑δ Q δ Formula 1; the M site element is a doping element of at least one of Li, H, Na, K, and Rb; the A site element includes Sr and / or Ca; the M1 site element includes at least one of Mg and rare earth elements; the M2 site element is a transition element; the Q site element includes at least one of halogen elements, N, and S; stoichiometric constants: 0≤α≤0.5, 0≤x≤0.5, 0≤y≤1.0, 0≤δ≤0.5, and 2≤n≤4, where α, x, and y are not simultaneously 0. This anode material possesses high energy density, ultra-fast charging capability, long cycle life, and intrinsic safety.

This invention belongs to the field of aromatic ring hydrogenation catalyst technology, and relates to a mixed oxide supported ultra-low ruthenium-based catalyst, its preparation method, and its application. This invention improves the acidic sites at the catalyst surface by controlling the proportion of the metal oxide support. Simultaneously, it utilizes the mesoporous structure and high specific surface area of ​​the support, and leverages the ruthenium catalytic active sites at the hydroxyl coordination sites on the support surface to effectively avoid the problem of catalytic metal aggregation and deactivation. This enhances the stability of the active metal in the catalytic material, inhibits its aggregation during the reaction, and thus significantly reduces the ruthenium loading of the catalyst. Ultimately, it obtains a catalytic system with high conversion, high selectivity, high TON value, and high TOF value, meeting the atom economy and environmental friendliness requirements of industrial production.

Cu / M has been developed 2+ M 3+ Oxide or CuO / M 2+ M 3+ The oxide catalyst is used to produce isobutanol in propanol-methanol, ethanol-methanol, and propanol / ethanol mixture-methanol reactions. This catalyst can also be used to produce n-butanol in ethanol-ethanol reactions. The Cu / M 2+ M 3+ Oxide or CuO / M 2+ M 3+ The oxide catalyst has an average Cu or CuO particle size greater than or equal to 20 nm. 2+ It may contain divalent magnesium, calcium, strontium, barium, zinc, or combinations thereof. M 3+ It may contain trivalent aluminum, gallium, chromium, or combinations thereof. A catalyst, a method for manufacturing the catalyst, and a method for using the catalyst are described.

The application relates to the technical field of titanium metal catalysts, in particular to a rare earth-titanium bimetallic nanostructure catalyst and a preparation method and application thereof. The catalyst is obtained by modifying a supported catalyst precursor by using P=O groups in phosphoric acid esters, and coating the supported catalyst precursor by generating a surface coordination structure; the supported catalyst precursor is obtained by anchoring and loading an amino carrier with a Si-O-Si-Y bond through a Ti-O-Si bond, using a mixed oxide sol network as a precursor; the precursor is obtained by using a diketone compound to chelate a carbonate, and then hydrolyzing and condensing with rare earth metal ions to form a mixed oxide sol network with Ti-O-Ti bonds and Ti-O-M bonds, that is, a bonding network is formed by the rare earth metal and titanium, and then a surface hydrophobic layer is constructed by using phosphoric acid esters, so that the hydrolysis half-life of the catalyst in a high-temperature and high-humidity environment is improved.